Synthesis of pressure-sensitive adhesives based on butyl acrylate, effect of cross-linking agent

Pressure-sensitive adhesives (PSAs) are viscoelastic materials which can adhere strongly to solid surfaces upon applying of slight contact pressure with a short time [1]. Synthesis of acrylate PSAs latex is accomplished through out a semi-continuous emulsion polymerization using butyl acrylate and acrylic acid monomers [1,2]. Urea formaldehyde resin (UF) was used as crosslinking agent to controlling the adhesive properties. In this work, effect of prepared urea formaldehyde resin on the latex of copolymer of butyl acrylate and acrylic acid properties such as shear strength, tack and peel strength was investigated. As the amount of urea formaldehyde was increased (up to 3.09%) in the resin, shear strength was increased from 230 kPa to a limited value of about 513 kPa (Figure 1), peel strength were increased from 0.23 N/mm to 0.31 N/mm, however, the amount of tack of the latex was reduced (from 2.9 cm to 5.5 cm).

Keywords:

pressure sensitive adhesive , emulsion polymerization , crosslinking agent , adhesive , acrylate latex